Upendra Mudugamuwa

University of Surrey, Guilford, England, United Kingdom

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Publications (7)8.01 Total impact

  • Source
    Linghang Fan, Hongfei Du, Upendra Mudugamuwa, B.G. Evans
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    ABSTRACT: The design of efficient packet scheduling algorithms, which play a key role in the radio resource management (RRM), is crucial for the multimedia delivery in the satellite digital multimedia broadcasting (SDMB) system. In this paper, a novel packet scheduling scheme, which uses the cross-layer approach in its design, is proposed. This scheme comprises a new service prioritization algorithm and a dynamic rate matching based resource allocation algorithm, aimed at utilizing both the applications' QoS attributes and the physical layer data rate information. The performance of the proposed scheme has been evaluated via simulation. In comparison with existing schemes, the proposed scheme achieves significant performance gain on delay, delay variation and physical channel utilization.
    IEEE Transactions on Broadcasting 01/2009; 54(4-54):806 - 815. DOI:10.1109/TBC.2008.2005397 · 2.65 Impact Factor
  • Source
    Hongfei Du, Linghang Fan, Upendra Mudugamuwa, B.G. Evans
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    ABSTRACT: In recent years, multimedia content broadcasting via satellite has attracted increased attention. The satellite digital multimedia broadcasting (S-DMB) system has emerged as one of the most promising alternatives for the efficient delivery of multimedia broadcast multicast service (MBMS). The design of an efficient radio resource management (RRM) strategy, especially the packet scheduling scheme, becomes a key technique for provisioning multimedia services at required quality of service (QoS) in S-DMB. In this article, we propose a novel cross-layer packet scheduling scheme that consists of a combined delay and rate differentiation (CDRD) service prioritization algorithm and a dynamic rate matching (DRM)-based resource allocation algorithm. The proposed scheme considers multiple key factors that span from the application layer to the physical layer, aiming at simultaneously guaranteeing diverse QoS while utilizing radio resources efficiently under the system power and resource constraints. Simulation results demonstrate that the proposed cross-layer scheme achieves significantly better performance than existing schemes in queuing delay, jitter, and channel utilization.
    IEEE Communications Magazine 09/2007; DOI:10.1109/MCOM.2007.4290320 · 4.46 Impact Factor
  • Linghang Fan, Hongfei Du, Upendra Mudugamuwa, Barry G. Evans
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    ABSTRACT: The design of efficient radio resource management (RRM) is crucial for the multimedia content delivery in the satellite digital multimedia broadcasting (SDMB) system. In this paper, a novel packet scheduling scheme with a new power allocation algorithm has been proposed, and its performance has been evaluated via simulations. In comparison with existing schemes, the proposed strategy achieves significant performance improvement, especially on delay and jitter. Nomenclature i α = QoS class factor ) (n i δ = the delay serving index at current time slot n for queue i i = Queue id n = the number of time slot d N = the number of packets that have been served and left the queue before this TTI q N = the number of packets that currently in the queue
  • U. Mudugamuwa, B. G. Evans
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    ABSTRACT: The inherent broadcast capabilities of satellites make them an attractive solution for the delivery of multimedia services to mobile users in third generation (3G) networks. Reliable delivery of content over a hostile land-mobile satellite channel is one of the key technical system requirements that can be addressed at different protocol layers. In this paper, we focus our attention on some of the mechanisms which can provide partial reliability: the packet-level forward error correction (PLFEC) technique in radio access network (RAN), different interleaving depths at physical layer (inter frame) and power allocation in the satellite radio interface. We rely on an end-to-end simulation platform in order to assess the performance gain achieved by these mechanisms separately, and provide clear indications for the achievable benefits at system level when some of these mechanisms act in co-ordination rather than in isolation. Copyright © 2006 John Wiley & Sons, Ltd.
    International Journal of Satellite Communications and Networking 03/2006; 24(2):169 - 184. DOI:10.1002/sat.837 · 0.90 Impact Factor
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    ABSTRACT: The inherent broadcast capabilities of satellites make them an attractive solution for the delivery of multimedia services to mobile users in third generation (3G) networks. Reliable delivery of content over the hostile land-mobile satellite channel is one of the key technical system requirements that can be addressed at different protocol layers. We focus our attention on two of these mechanisms that provide non-perfect reliability: the packet-level forward error correction technique at the transport layer and the power scheduling function in the satellite radio interface. We rely on an end-to-end simulation platform in order to assess the performance gain achieved by the two mechanisms, providing at the same time clear indications for the achievable benefit at system level when the two mechanisms act in co-ordination rather than in isolation.
    Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th; 06/2004
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The inherent broadcast capabilities of satellites make them an attractive solution for the delivery of multimedia services to mobile users in third generation (3G) networks. Reliable delivery of content over a hostile land-mobile satellite channel is one of the key technical system requirements that can be addressed at different protocol layers. In this paper, we focus our attention on two of the mechanisms which provide partial reliability: the Packet-Level Forward Error Correction (PLFEC) technique in Radio Access Network (RAN) and different interleaving depths at physical layer (inter frame) in the satellite radio interface. We rely on an end-to-end simulation platform in order to assess the performance gain achieved by the two mechanisms separately, and providing clear indications for the achievable benefits at system level when the two mechanisms act in co-ordination rather than in isolation.
  • Hongfei Du, Linghang Fan, Upendra Mudugamuwa, Barry G Evans
    [Show abstract] [Hide abstract]
    ABSTRACT: In recent years, multimedia content broadcasting via satellite has attracted increased attention. The satellite digital multimedia broadcasting (S-DMB) system has emerged as one of the most promising alternatives for the efficient delivery of multimedia broadcast multicast service (MBMS). The design of an efficient radio resource management (RRM) strategy, especially the packet scheduling scheme, becomes a key technique for provisioning multimedia services at required quality of service (QoS) in S-DMB. In this article, we propose a novel cross-layer packet scheduling scheme that consists of a combined delay and rate differentiation (CDRD) service prioritization algorithm and a dynamic rate matching (DRM)-based resource allocation algorithm. The proposed scheme considers multiple key factors that span from the application layer to the physical layer, aiming at simultaneously guaranteeing diverse QoS while utilizing radio resources efficiently under the system power and resource constraints. Simulation results demonstrate that the proposed cross-layer scheme achieves significantly better performance than existing schemes in queuing delay, jitter, and channel utilization.